669538564553 has 2 divisors, whose sum is σ = 669538564554. Its totient is φ = 669538564552.

The previous prime is 669538564507. The next prime is 669538564589. The reversal of 669538564553 is 355465835966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 669536335504 + 2229049 = 818252^2 + 1493^2 .

It is a cyclic number.

It is not a de Polignac number, because 669538564553 - 2⁸ = 669538564297 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 669538564553.

It is not a weakly prime, because it can be changed into another prime (609538564553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334769282276 + 334769282277.

It is an arithmetic number, because the mean of its divisors is an integer number (334769282277).

Almost surely, 2^669538564553 is an apocalyptic number.

It is an amenable number.

669538564553 is a deficient number, since it is larger than the sum of its proper divisors (1).

669538564553 is an equidigital number, since it uses as much as digits as its factorization.

669538564553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 349920000, while the sum is 65.

The spelling of 669538564553 in words is "six hundred sixty-nine billion, five hundred thirty-eight million, five hundred sixty-four thousand, five hundred fifty-three".